'2015/09/02'에 해당되는 글 4건

  1. 2015.09.02 DVP / MIPI ...?
  2. 2015.09.02 i2c bank switching
  3. 2015.09.02 라즈베리 파이 MAC address 관련
  4. 2015.09.02 UTC / Up the cable, coxial
하드웨어/캡쳐보드 카메라2015. 9. 2. 22:45

DVP / MIPI ...?

MIPI(Mobile Industry Processor Interface) 나 

DVP(Digital Video Port)나 둘다

I2C를 통해서 레지스터를 조작해 장치를 제어하는 건 동일하나

데이터가 시리얼이냐 패러럴이냐의 차이인듯?




[링크 : http://mipi.org/specifications/camera-interface]


For a standard DVP image sensor you will find the following signals:


SCL: I2C compatible clock signal for sensor registers configuration

SDA: I2C compatible data signal for sensor registers configuration

XCLK: clock input to the sensor

PCLK: clock output from the sensor,

HREF: Line valid signal

VSYNC: Frame valid signal

Data[N-1..0]: Data output from the sensor, N is the internal ADC bit width.

[링크 : http://www.arducam.com/hardware/]


[링크 : http://www.seeedstudio.com/wiki/images/3/3c/Ov5647_full.pdf]

[링크 : http://www.voti.nl/docs/OV7670.pdf]

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embeded/i2c2015. 9. 2. 17:31

i2c bank switching

주소번지의 한계를 넘기기 위해 

일종의.. 페이징? 이라고 해야 하려나?


Bank Switching Operation

I2C can access 256 addresses directly (i.e. 0x00 through 0xFF).

SMBus can access 128 addresses directly (i.e. 0x00 through 0x7F).

NB3H5150 has an address space which goes up to 0x14F. Therefore, a “bank switching” mechanism is included to allow access to all addresses no matter which bus protocol is used. Effectively, the two bank select bits are appended to the most-significant end of the seven-bit byte offset, creating a nine-bit address. The bank switch control bits(6:7) are located in Register 0x21.

The most significant two bits of that register are used for bank selection; the least significant six bits are used for the READBYTECOUNT Function.


[링크 : http://www.onsemi.com/pub_link/Collateral/NB3H5150_I2C_MANUAL.PDF]

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embeded/raspberry pi2015. 9. 2. 16:23

라즈베리 파이 MAC address 관련


CPU의 시리얼 번호를 기반으로 MAC을 생성 하는 듯?

그나저나.. BogoMIPS가 멋대로 바뀌네? ㄷㄷㄷ


타이머로 변경되면서 클럭 변경되면 다르게 나오려나?

$ cat /proc/cpuinfo

processor       : 0

model name      : ARMv7 Processor rev 5 (v7l)

BogoMIPS        : 38.40

Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpae evtstrm

CPU implementer : 0x41

CPU architecture: 7

CPU variant     : 0x0

CPU part        : 0xc07

CPU revision    : 5 


$ cat /proc/cpuinfo

processor       : 3

model name      : ARMv7 Processor rev 5 (v7l)

BogoMIPS        : 57.60

Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpae evtstrm

CPU implementer : 0x41

CPU architecture: 7

CPU variant     : 0x0

CPU part        : 0xc07

CPU revision    : 5


Hardware        : BCM2709

Revision        : a21041

Serial          : 00000000a37ce24e


$ sudo cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq; cat /proc/cpuinfo

900000

processor       : 0

model name      : ARMv7 Processor rev 5 (v7l)

BogoMIPS        : 57.60

Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpae evtstrm

CPU implementer : 0x41

CPU architecture: 7

CPU variant     : 0x0

CPU part        : 0xc07

CPU revision    : 5


$ sudo cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq; cat /proc/cpuinfo

600000

processor       : 0

model name      : ARMv7 Processor rev 5 (v7l)

BogoMIPS        : 38.40

Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpae evtstrm

CPU implementer : 0x41

CPU architecture: 7

CPU variant     : 0x0

CPU part        : 0xc07

CPU revision    : 5


---

라즈 B


# cat /proc/cpuinfo

processor       : 0

model name      : ARMv6-compatible processor rev 7 (v6l)

Features        : half thumb fastmult vfp edsp java tls

CPU implementer : 0x41

CPU architecture: 7

CPU variant     : 0x0

CPU part        : 0xb76

CPU revision    : 7


Hardware        : BCM2708

Revision        : 000e

Serial          : 0000000055593a15


# ifconfig

eth0      Link encap:Ethernet  HWaddr B8:27:EB:59:3A:15

---



$ ifconfig
eth0      Link encap:Ethernet  HWaddr b8:27:eb:7c:e2:4e
          inet addr:192.168.10.23  Bcast:192.168.10.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1685 errors:0 dropped:2 overruns:0 frame:0
          TX packets:358 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:107201 (104.6 KiB)  TX bytes:52547 (51.3 KiB)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:8 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1104 (1.0 KiB)  TX bytes:1104 (1.0 KiB)


$ cat /sys/class/net/eth0/address

b8:27:eb:7c:e2:4e


[링크 : http://www.robert-drummond.com/2013/05/23/how-to-find-the-mac-address-of-your-raspberry-pi/]

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회사일2015. 9. 2. 16:06

UTC / Up the cable, coxial

네이밍 센스가... 다른건가


[링크 : http://www.ktncusa.com/_media/EZHD-CameraChart_vs1.2.pdf]

[링크 : https://www.youtube.com/watch?v=3SGll7OdHdI]

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